There are two important implications of sukha’s non-energetic quality. The first is that it is highly sustainable because it does not require exertion of energy. The second is that because it does not require energy, it is so subtle that it takes a very quiet mind to access, like a soft background hum that is audible only when nobody in the room is talking loudly. What that means is you need to learn to quiet your mind to access sukha, but once you become skillful at doing that, you have a highly sustainable source of happiness
